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Arris

From Biology-Online Dictionary
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Arris

The sharp edge or salient angle formed by two surfaces meeting each other, whether plane or curved; applied particularly to the edges in moldings, and to the raised edges which separate the flutings in a doric column. Arris fillet, a triangular piece of wood used to raise the slates of a roof against a chimney or wall, to throw off the rain. Arris gutter, a gutter of a v form fixed to the eaves of a building.

Origin: OF. Areste, f. Arete, fr. L. Arista the top or beard of an ear of grain, the bone of a fish.